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(3/10)*(20*x-15) = 2*x-12 // - 2*x-12
(3/10)*(20*x-15)-(2*x)+12 = 0
(3/10)*(20*x-15)-2*x+12 = 0
3/10*(20*x-15)-2*x+12 = 0
3/10*(20*x-15)-2*x+12 = 0
4*x-9/2+12 = 0
4*x+15/2 = 0
4*x+15/2 = 0
4*x+15/2 = 0 // - 15/2
4*x = -15/2 // : 4
x = -15/2/4
x = -15/8
x = -15/8
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